You can use Robocopy.
robocopy source destination [file [file]...]
So for example to copy your files from folder D:\MyData to folder E:\Test you can use:
robocopy D:\MyData E:\Test File1.txt ...
I do not have K8 or even docker. The info I am providing is something that was brought up in a recent meeting I was in.
As per my comment.
Are you saying, you've set your environment variables, ...